Power LED from RF?
I have a maybe somewhat unusual question.There is a super simple circuit that enables an LED to be powered by ringing mobile phone.
Can be found at http://www.creative-science.org.uk/mobile_LED_simple.html
What I would like to do is to power LED but from a distance, preferably Radio Stations of (if possible) power lines.
LED does not have to be constantly on or bright, it can "blink".
I was looking at Joule Thief and combining it with capacitor ...
The point is that there should be no battery.
Is such a thing possible?
Can be found at http://www.creative-science.org.uk/mobile_LED_simple.html
What I would like to do is to power LED but from a distance, preferably Radio Stations of (if possible) power lines.
LED does not have to be constantly on or bright, it can "blink".
I was looking at Joule Thief and combining it with capacitor ...
The point is that there should be no battery.
Is such a thing possible?
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Only if you are prepared to wait for a very long time before you can get an LED to flash. The energy has to come from somewhere, and the amount you receive varies with the square of distance from the source.
Steve
Steve
Depends on the quality of tuning, and the distance to the source. Any of the above. Stealing RF energy has been done before, but generally only in very very close proximity to the source antenna. One guy in the UK many years ago was convicted of stealing electricity near a very strong LW source, by dint of adding rectifiers to his house wiring !
Steve
Steve
Jul 14, 2011. 1:41 AMnccwarp9 (author)
says:
Something like ... ??
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HLMP-P156-EG031-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HLMP-P156-EG031-ND
Jul 13, 2011. 5:41 AMRe-design
says:
I doubt that you could ever get enough current from the air waves to power an led. The amount available if extremely small, even when using huge antennas. Radio works by using very sensitive devices and amplifying the current to a usable level.
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